东海陆架平北地区残留沉积磁性特征及其油气指示意义

doi:10.7605/gdlxb.2001.02.005

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Abstract

In order to reveal the relationship between magnetic properties of the relict sediment and hydrocarbon seepage, a total of three hundred and seventy vibro-cores were taken from the Pingbei area of the East China continental shelf during 1994-1995. Six magnetic parameters were used to define the magnetic minerals, which include magnetic susceptibility (χ), SIRM, SIRM/χ, χFD, IRMkmT/SIRM, and S－kmT. The magnetic measurements demonstrate that there are two different types of magnetic anomaly highs, i.e., χhigh and SIRM high. According to the magnetic properties, we propose that the minerals which dominates the χhigh sediment are magnetites, and minerals which cause the SIRM high are iron sulphides such as greigite and pyrrhotite.Magnetic minerals of the two types of magnetic anomaly high sediments were separated. Identification under reflect light microscopes proves that the magnetic separates from the χhigh is detrital magnetite. Analyses of the SEM-EDX, M?ssbauer Spectrum and XRD demonstrate that the magnetic separates from SIRM high sediment are predominantly greigite and pyrrhotite.The χhighs occur at the sand bodies which are formed during the late Pleistocene transgression. Distribution of the SIRM highs in the study area coincides with that of the tectonic-controlled hydrocarbon traps and geochemical anomalies. This suggests that the iron sulphides generating the anomaly high SIRM in the study area are products of the hydrocarbon seepage. It is thus proposed that the SIRM can be selected as a proper parameter for magnetic detection of oil fields in the study area.

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Published: 01 April 2001

About author: Wang Zhanghua, born in 1973, has won her Ph.D degree from the East China Normal University in 2000. She is now working on sedimentology and environmental changes at the Department of Geography, East China Normal University.

Cite this article:

. Magnetic Properties of the Relict Sediments in the Pingbei area of the East China Continental Shelf: Implication for Hydrocarbon Seepage[J]. JOURNAL OF PALAEOGEOGRAPHY, 2001, 3(2): 38-46.

. Magnetic Properties of the Relict Sediments in the Pingbei area of the East China Continental Shelf: Implication for Hydrocarbon Seepage[J]. JOPC, 2001, 3(2): 38-46.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2001.02.005 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2001/V3/I2/38

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